Fix -Wsign-compare in l10n_string_util_unittest.cc

chrome/installer/util/l10n_string_util_unittest.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/installer/util/l10n_string_util.h"
 
 #include "base/macros.h"
 #include "chrome/install_static/install_modes.h"
 #include "chrome/install_static/test/scoped_install_details.h"
 #include "chrome/installer/util/installer_util_strings.h"
@@ skipping 47 matching lines @@
       {IDS_APP_SHORTCUTS_SUBDIR_NAME_CANARY_BASE,
        IDS_INBOUND_MDNS_RULE_DESCRIPTION_CANARY_BASE,
        IDS_INBOUND_MDNS_RULE_NAME_CANARY_BASE, IDS_SXS_SHORTCUT_NAME_BASE});
 
   // Run through all install modes, checking that the mode-specific strings are
   // mapped properly by GetBaseMessageIdForMode.
   ASSERT_EQ(install_static::NUM_INSTALL_MODES, mode_to_strings.size());
   for (int mode_index = 0; mode_index < install_static::NUM_INSTALL_MODES;
        ++mode_index) {
     SCOPED_TRACE(testing::Message() << "install mode index: " << mode_index);
-    ASSERT_EQ(1, mode_to_strings.count(mode_index));
+    ASSERT_EQ(1U, mode_to_strings.count(mode_index));
     const auto& mode_strings = mode_to_strings[mode_index];
     ASSERT_EQ(mode_strings.size(), input_ids.size());
 
     install_static::ScopedInstallDetails install_details(false, mode_index);
     for (size_t i = 0; i < input_ids.size(); ++i)
       EXPECT_EQ(mode_strings[i], GetBaseMessageIdForMode(input_ids[i]));
   }
 }
 #endif  // defined(GOOGLE_CHROME_BUILD)
 
 }  // namespace installer